kgeiger writes: Voting machine designs and data formats are a free-for-all. The result is poor validation and hence opportunity for fraud. From TFA:

IEEE Standards Project 1622 is working on electronic data interchange for voting systems. The plan is to create a common format, based on the Election Markup Language (EML) already recommended for use in Europe. This is a subset of the popular XML (eXtensible Markup Language) that specifies particular fields and data structures for use in voting.